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cryptopp-cmake/basecode.cpp at master · 0Knowledge/cryptopp-cmake · GitHub
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//
basecode.cpp - written and placed in the public domain by Wei Dai
#
include
"
pch.h
"
#
ifndef
CRYPTOPP_IMPORTS
#
include
"
basecode.h
"
#
include
"
fltrimpl.h
"
#
include
<
ctype.h
>
NAMESPACE_BEGIN
(CryptoPP)
void
BaseN_Encoder::IsolatedInitialize
(
const
NameValuePairs ¶meters)
{
parameters.
GetRequiredParameter
(
"
BaseN_Encoder
"
,
Name::EncodingLookupArray
(), m_alphabet);
parameters.
GetRequiredIntParameter
(
"
BaseN_Encoder
"
,
Name::Log2Base
(), m_bitsPerChar);
if
(m_bitsPerChar <=
0
|| m_bitsPerChar >=
8
)
throw
InvalidArgument
(
"
BaseN_Encoder: Log2Base must be between 1 and 7 inclusive
"
);
byte padding;
bool
pad;
if
(parameters.
GetValue
(
Name::PaddingByte
(), padding))
pad = parameters.
GetValueWithDefault
(
Name::Pad
(),
true
);
else
pad =
false
;
m_padding = pad ? padding : -
1
;
m_bytePos = m_bitPos =
0
;
int
i =
8
;
while
(i%m_bitsPerChar !=
0
)
i +=
8
;
m_outputBlockSize = i/m_bitsPerChar;
m_outBuf.
New
(m_outputBlockSize);
}
size_t
BaseN_Encoder::Put2
(
const
byte *begin,
size_t
length,
int
messageEnd,
bool
blocking)
{
FILTER_BEGIN
;
while
(m_inputPosition < length)
{
if
(m_bytePos ==
0
)
memset
(m_outBuf,
0
, m_outputBlockSize);
{
unsigned
int
b = begin[m_inputPosition++], bitsLeftInSource =
8
;
while
(
true
)
{
assert
(m_bitPos < m_bitsPerChar);
unsigned
int
bitsLeftInTarget = m_bitsPerChar-m_bitPos;
m_outBuf[m_bytePos] |= b >> (
8
-bitsLeftInTarget);
if
(bitsLeftInSource >= bitsLeftInTarget)
{
m_bitPos =
0
;
++m_bytePos;
bitsLeftInSource -= bitsLeftInTarget;
if
(bitsLeftInSource ==
0
)
break
;
b <<= bitsLeftInTarget;
b &=
0xff
;
}
else
{
m_bitPos += bitsLeftInSource;
break
;
}
}
}
assert
(m_bytePos <= m_outputBlockSize);
if
(m_bytePos == m_outputBlockSize)
{
int
i;
for
(i=
0
; i<m_bytePos; i++)
{
assert
(m_outBuf[i] < (
1
<< m_bitsPerChar));
m_outBuf[i] = m_alphabet[m_outBuf[i]];
}
FILTER_OUTPUT
(
1
, m_outBuf, m_outputBlockSize,
0
);
m_bytePos = m_bitPos =
0
;
}
}
if
(messageEnd)
{
if
(m_bitPos >
0
)
++m_bytePos;
int
i;
for
(i=
0
; i<m_bytePos; i++)
m_outBuf[i] = m_alphabet[m_outBuf[i]];
if
(m_padding != -
1
&& m_bytePos >
0
)
{
memset
(m_outBuf+m_bytePos, m_padding, m_outputBlockSize-m_bytePos);
m_bytePos = m_outputBlockSize;
}
FILTER_OUTPUT
(
2
, m_outBuf, m_bytePos, messageEnd);
m_bytePos = m_bitPos =
0
;
}
FILTER_END_NO_MESSAGE_END
;
}
void
BaseN_Decoder::IsolatedInitialize
(
const
NameValuePairs ¶meters)
{
parameters.
GetRequiredParameter
(
"
BaseN_Decoder
"
,
Name::DecodingLookupArray
(), m_lookup);
parameters.
GetRequiredIntParameter
(
"
BaseN_Decoder
"
,
Name::Log2Base
(), m_bitsPerChar);
if
(m_bitsPerChar <=
0
|| m_bitsPerChar >=
8
)
throw
InvalidArgument
(
"
BaseN_Decoder: Log2Base must be between 1 and 7 inclusive
"
);
m_bytePos = m_bitPos =
0
;
int
i = m_bitsPerChar;
while
(i%
8
!=
0
)
i += m_bitsPerChar;
m_outputBlockSize = i/
8
;
m_outBuf.
New
(m_outputBlockSize);
}
size_t
BaseN_Decoder::Put2
(
const
byte *begin,
size_t
length,
int
messageEnd,
bool
blocking)
{
FILTER_BEGIN
;
while
(m_inputPosition < length)
{
unsigned
int
value;
value = m_lookup[begin[m_inputPosition++]];
if
(value >=
256
)
continue
;
if
(m_bytePos ==
0
&& m_bitPos ==
0
)
memset
(m_outBuf,
0
, m_outputBlockSize);
{
int
newBitPos = m_bitPos + m_bitsPerChar;
if
(newBitPos <=
8
)
m_outBuf[m_bytePos] |= value << (
8
-newBitPos);
else
{
m_outBuf[m_bytePos] |= value >> (newBitPos-
8
);
m_outBuf[m_bytePos+
1
] |= value << (
16
-newBitPos);
}
m_bitPos = newBitPos;
while
(m_bitPos >=
8
)
{
m_bitPos -=
8
;
++m_bytePos;
}
}
if
(m_bytePos == m_outputBlockSize)
{
FILTER_OUTPUT
(
1
, m_outBuf, m_outputBlockSize,
0
);
m_bytePos = m_bitPos =
0
;
}
}
if
(messageEnd)
{
FILTER_OUTPUT
(
2
, m_outBuf, m_bytePos, messageEnd);
m_bytePos = m_bitPos =
0
;
}
FILTER_END_NO_MESSAGE_END
;
}
void
BaseN_Decoder::InitializeDecodingLookupArray
(
int
*lookup,
const
byte *alphabet,
unsigned
int
base,
bool
caseInsensitive)
{
std::fill
(lookup, lookup+
256
, -
1
);
for
(
unsigned
int
i=
0
; i<base; i++)
{
if
(caseInsensitive &&
isalpha
(alphabet[i]))
{
assert
(lookup[
toupper
(alphabet[i])] == -
1
);
lookup[
toupper
(alphabet[i])] = i;
assert
(lookup[
tolower
(alphabet[i])] == -
1
);
lookup[
tolower
(alphabet[i])] = i;
}
else
{
assert
(lookup[alphabet[i]] == -
1
);
lookup[alphabet[i]] = i;
}
}
}
void
Grouper::IsolatedInitialize
(
const
NameValuePairs ¶meters)
{
m_groupSize = parameters.
GetIntValueWithDefault
(
Name::GroupSize
(),
0
);
ConstByteArrayParameter separator, terminator;
if
(m_groupSize)
parameters.
GetRequiredParameter
(
"
Grouper
"
,
Name::Separator
(), separator);
else
parameters.
GetValue
(
Name::Separator
(), separator);
parameters.
GetValue
(
Name::Terminator
(), terminator);
m_separator.
Assign
(separator.
begin
(), separator.
size
());
m_terminator.
Assign
(terminator.
begin
(), terminator.
size
());
m_counter =
0
;
}
size_t
Grouper::Put2
(
const
byte *begin,
size_t
length,
int
messageEnd,
bool
blocking)
{
FILTER_BEGIN
;
if
(m_groupSize)
{
while
(m_inputPosition < length)
{
if
(m_counter == m_groupSize)
{
FILTER_OUTPUT
(
1
, m_separator, m_separator.
size
(),
0
);
m_counter =
0
;
}
size_t
len;
FILTER_OUTPUT2
(
2
, len =
STDMIN
(length-m_inputPosition, m_groupSize-m_counter),
begin+m_inputPosition, len,
0
);
m_inputPosition += len;
m_counter += len;
}
}
else
FILTER_OUTPUT
(
3
, begin, length,
0
);
if
(messageEnd)
{
FILTER_OUTPUT
(
4
, m_terminator, m_terminator.
size
(), messageEnd);
m_counter =
0
;
}
FILTER_END_NO_MESSAGE_END
}
NAMESPACE_END
#
endif
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